Internal grinder and polisher



April 29, 1947. H. H. TALBoYs INTERNAL lGRINDER AND 4}."O)` |]SII}EIR Filed Jan. 25, 1945 7 Sheets-Sheet l 3. mk l .k L /H m im www ...iD

April 29, 1947.

H. H. TALBOYS INTERNAL GRIYNDER AND POLISHER Filed Jan. 25, 1943 7 sheets-sheet 2 April 29, 1947 Y' H. H. TALBYS 2,419,665

INTERNAL GRINDER AND POLISHER Filed Jan'. 25, 1943 7 Sheets-Sheet 5 wry/@www y Mm" April 29, 1947.

H. H. TALBOYS INTERNAL GRINDER AND POLISHER Filed Jan. V25, 1943 7 Sheets-Sheet 21 April 29, 1947. v H. H. TALBoYs INTERNAL GRINDER AND POLISHER Filed Jan. 25, 1943 T Sheets-Sheet 5 ff/aways Ap 29, 1947. H. H. TALBoYs 2,419,655

`INTERNAL GRINDER AND POLISHER Filed Jan. 25, 1943 7 Sheets-Sheet 6 my Q Y ww@ mm April 29, 1947.

H. H. TALBOYS INTERNAL GRINDER AND POLISHER Filed Jan. 25, 1943 7 Sheets-Sheet 7 ing it of `uniform diameter. Another purpose is the provision Y1r` rmfed-means for actuating an interior rotaryfinisher; Y

-the vline 3 -3 of Figure 2; Y

Figure 4; 1

along the line Ill-I of Figure l; Y

Patented pr. 29, 1947 i;

UNITED STATES PATENT OFFICE yThis invention relates to an improvement in means for nishing the interior of cylindrical members. One purpose of the invention is the -provision of an interior finisher which is effected "to smooth an inner cylindrical surface.

`Another purpose of the invention is the provision of means for truing such surface andrenderof an im- Another purpose isthe provision of improved means for `delivering cooling liquid to such a finisher; Y

VAnotherpurpose is the provision of improvedA means for supporting such iinisher; f

-means for rounding the work With-the .finishen YAnother-purpose is the provision of improved 'means for moving the work in relation 'to-'the Other purposes will appear from time to time throughout the specification andclaims. Y

lThe invention is illustrated more or less diagrammatically inthe wherein:

Figure lis a side elevation tion;

Figure 2 is a plan view; f f- Figure 3 is a section on an enlarged scale along with parts .in secl Figure 4 is a section along 4Figure 3;-v

Figure 5 is a side elevation o f an abrasive Segment;

' Figure 6 is a plan view of the structure shown inFigurei; l

Figure 7 is a plan view of the shoe employed in 'Figure 8 is asection on an enlarged scale along the line 8-8 of Figurel; l Y- "-ff vFigure V10 is a sectionon an enlarged`v scale l 1 Figure 11 -is asection along the-line II"'II'of fie claims.

accompanying drawings,

f Figure 12 is a section on an enlarged scale along 4 theilirie -I2-I2 of Figure 11;

fis-mounted here indicated Vas :a floor. -floor is illustrated any suitable base herein shown as# including apair. of longitudinally extending fI-beamsZ; connected by a bottom plate 3, and -rendf portions 4, whereby an open topped tank is Figure -13 is a, section along the line I3I3 of "Figure 14 is an axial section through a variant form of head;

Like parts are indicated by like characters throughout the-'specification and drawings.

'Referring to the drawings, I indicate'sanysuitable-supportingstructure upon which the device On the "provided, If necessary, any suitable transverse g.forpermitting'liquid to flow therethrough.. vI :generally indicates a support upstanding from "the base Vmembers 2.

|`manner'on this upstanding support 'I, for examplefwelded thereto, is a tubular member II. It

connectors 5, may be employed. The intermediate members may be provided with openings 6 It may include end suppor-ts8 ,1and's ide plates 9,the side plates being broken laway-as at I0. Mounted in any suitable ==willlbe .understood that thelongitudinal extension t of themember 1 is sufficient so that the tube I I, although as shown .in Figure 1 extends laterally a substantial distance from the support 1, is held j lwith substantial rigidity.

...Referring for example to Figure 3, the tube II is provided at each end with head rings I2. -Mountedin thefleit hand head ring, referring to the-parts `as shown in the position shown in Figure 3,f is abearing assembly including a ring I3,

f 'asleeve I4 shown `as integral therewith and hav- I5.-1A"ball bearing assembly is generally indi- A'suitable vballibearing assembly I8 is mounted within the V right handhead ring I2, for example by means Figure 9 is a section on an enlarged scale alorigf45" i the une vs -9 of Figure 1 Wfh parts omitted:

ofv plate I9. An intermediate ball bearing as- Y'semlo1y 20 within a ring 2l may be adjusted for corresponding groove 25 in the exterior of the ring l#flanges 54 on 4the .opposite rings 15|.

llink l.

2|. Within the three ball bearing assemblies I6, I3 and 20 rotates the shaft 26 herein shown as hollow. r:Che shaft may be driven by any suitable pulley 21 about which pass one or more belts 28, which in turn extend about the drive pulley 29 in any suitable motor 36 mounted at any suitable location in relation to the base members 2. Any suitable switch not here shown may be employed for controlling the motor circuit. It may be advantageous to have the shaft 26 constantly driven.

Mounted on the opposite end of the shaft from the Pulley 21 Ais a Agrinder or inishing-'as'sembly generally indicated as A. It includes a hu'b 3| keyed on the shaft 26 and held by the retaining Washer 32 and the screw 33. The screw 33 penetrates a ller block 34 xed in relation to the .shaft 26 and provided with a longitudinal bore 35 communication with the hollowinteriorbffthe shaft 26 and closed at its outer endby the plug l3.6. It will be understood that a iluid, for example va cooling liquid may be admitted .to the hollow inf terior of the shaft 26 through any suitabletting 31 in communication with any suitable :source of; the 1iquid.

I illustrate for vexample a -tube 38 extending to a pump 39 driven for example by .a mot-or 40.

Thegline 4| extends to the vabove described tank within the base members 2 and it will be -underrstOxOd .that the cooling liquid may be .recirculated from the tank. Any suitable means Ymay be employed, if desired, for -ltering the liquid but it will be understood that the tank serves as a -settling chamber. y

Inforderato vdeliver the cooling yliquid to .the work adjacent the operating point, there is illustrateda pair Vof generally radially extending delivery ducts 45 in communicationwith the bore y35,--forIexarnple bypassages 46, communicating with ia .cored or 'bored out aperture 41 in the hub .3.4. The delivery ends of the ...passages 45 maybe .inclined as shown in Figure 3 and are Apositioned finzproper relation to the :grinding-segments below .-described. i

49,149 indicate apair of hub `disks vpressed on orotherwise secured to the sleeve or hub 3|. Referring for Vexample to Figures 3 and 4, there are illustrated a plurality of radial arms 50 four 1 extending from each ofthe hub plates 49, each supporting aring 5|. The rings 5| denne between vthem a space for .two or more `shoes-.orsegment holders ygenerallyindicated .at 5:3.

The inward :movement of these segment holders toward .the .axis of the head 'is limited-.by inwardly extending Eachseament holder includes an varcuate bottom plate 55 with a radially inwardly .extending ange 56 and ,side plates 51 terminating-ininwardlyextending anges 58. Theflange 55 `has pivoted .thereto :a link.59,^thel opposite end .of which is pivoted toa lever which with its associated lever 6| -forms a bell `crank lever structure pivoted at 62 to the i :rings-5L. Adjustable on Ythe lever 6| is a counterlweight 63. VSil is a spring extending ifrom the outer end ofgthe -lever 5| to the .hub Aplates v'49,

where if desired, 'it may be secured to 4a, pin 65 extending between the hub plates. At :the forwardtend ofthe shoe are lugs 66 to which are'piv- .oted a, link '61 pivoted in turn as at l|58 to the `rings 15|.` It may be advantageous to provide a counterweight 69 at the forward end of the 1b indicate removable abrasive or polishin'er segments which are provided with chan- The rear end A of the :shoe 4is iopenf-.to

permit the insertion of the segments 10 and any suitable retaining plate 1| could be employed.v

and Yabout the tube with its `inner surface in engagement with the iinishinghead. In the main, the length of the work is preferably less than the length of the member so that the .work may .be .operated upon from end to end by merely moving the work in relation to the rotary ',gheadA.

.motor |08,

In order 4to move, guide and support the work, there are employed a pair of tracks 86. They are shown, -for example in Figure 9 as circular bars mounted on supports 3| upwardly extending from the iside frame members 2. Mounted to ride on the rails is a carriage including end plates 82, bottom members 83 and `side plates 84. Downxvardly :extendingfrom the bottom members y8-3 vare. forks '-8,5 :in which 'are -rotatably mounted rail engaging wheels 86;-.which may be -provided with ball bearings. Intermediate supportingplates 82a may also be provided for taking work of various size. As a matter ofconvenience, the plates 82 and 82a are shown as having semi-circular top .edges 68., This Ymay be a convenience where .the

lheadA. In the event that the workhas aperturesin it as are shownjfor example at 93, in the workgenerally indicated as 92 in Figurel, it may be advantageous to surround the apertured portion .of thev work'with any suitableguard orshield 94 whereby the vescape of the cooling liquid isprevented, the. liquid :being Acaught by the shield. Similarly a lower shield 95may be employed with a bottom drainage opening S6. y I

In order: to'actuate .the work andthe supporting carriage therefor, there is provided a longitudinal extending rack :bar -98 carrying a lrack 1.9.9 iin mesh with a pinion Hlldriven Vby-a shaft Illl, sprocket |62, chain|-,3,fsprocket |04, and

A.gear.reduction |65. |06 is `a belt extending to the drive pulley |01 of any suitable reversing '|09 is any suitable overload release. One end of the rack is connected to the carriage asat .H0 tto the downwardly projecting stop bar ||2 is any suitable hold down .roller for holding the ,rack downwardly against the pinions |00. The rack bar, beyond the pinion le!) may be supported in anyfsuitable guiding and supporting angles H3, which maybe supported in any suitable manner, kfor examp-leasat H4. ||5 is any suitable'term-inal stop which may have an adjustable member |-|6 `for .engaging the end of the rack bar 98. :I lvlisfanysuitable stop member vwith .an adjustable member |.|8 for the opposite end of thecarriage excursion. It is shown as pivoted at I I9 so that it can be alternately positioned in two different positions.

. It will be understoodV that in the operation of the device, /the stops need not normally be ein-.- ployed. For example, an'ysuitable control may be .employed for the motor for insuring if desired,

yan automatic reversal. When such automaticreversing `means are employed, the carriagewill move alternately in each direction reversing its direction at some predetermined point.

Referring to the form of Figuresy 14 and'15, there is illustrated a variant form of head in which cutting or grinding elements are mounted forcentrifugal generally axial sliding movement.

-Thereis illustrated for example, a hollow hub I lwhich is substantially the same as the hub shown Vin Figure 3; The details therefore will not be redescribed.

Extending radially therefrom are channels I2| which may beheld on the hub for example by pressed rings |22, |23. The structure .as a whole is preferably welded together. `Supported at the outer ends of the channe1s,vone at eachside of the head are end cages formed of U- .shaped membersy I 24 with end platesv I 25; slidable Within the channel formed by the U -shaped members |24, are abrasive or polishing elements |26 which may, if desired, be mounted in metal shells |21. In response to rotation ofthe head, the grinding members I 2B move centrifugally outwardly against the work 92 as shown for example in Figure l5. The cooling liquid may be delivered from the interior of the hollow hub I 2U by any suitable passages I 28 which communicate with distribution pipes. |29 which may be providedwith slots or a plurality of apertures |30 which, spray the liquid infront ofthe zone of engagement of the members |26 with the work.

, v Itr will -be realized that Whereas I have shown and described an' operating device, still many changes might be made in the size, shape, 'arrangement, number and disposition of parts without departing materially from the spirit of my invention. I wish, therefore, that my showing betaken as in a largesensediagrammatic and illustrative. For example, vit will be understood -that depending` upon the .shape of the work, a

variety of adjusting ,means may be employed( associated with the carriage. What is essential is that there shall be an initial reasonably `accurate alignment between the rotating element A and the inner aperture of the work.

Theuse and operation of this invention areas follows:

.There is provided by lthe present invention, means .for and a method of finishing the interiori of a more or less elongated cylindrical aperture.

It is applicable, for example,fto engine cylinders preferably ofrelatively large size or to large valve blocks or in general tubular members` and housings Where a smooth inner' surface is desired. Foril example, where pistons or moving parts are `employed within a cylindrical bore in the particular exemplication; herein described and shown, a grinding or finishing head is provided at the extremity of an arm or support of substantial length, The support is shown as horizontal but i it will be understood, of course, that the work can be moved about on the support even though the support is angularly disposed in relation to the horizontal. In any event, some appropriate carrying' means is employed such as the carriage, herein shown, for receiving thev Work and for moving the Work alternative in opposite directions sovrthat, during rotation of-the headAA, thebore of the work is subjected to the centrifugalthrust yterweightsml? are so manipulatedthat the cen- ...6 ofthe segments- III against-the innellface of the work. A,The segments IIJ andjthe s hoesini which they .are` mounted are thrust outwardly v in such manner-` that centrifugal force permitsthemgto jadjusttheir position-lin relation to the inner face .Qf. the .Workf-f The thrust is sufficient t0 smooth the surface of the work and, duringrelative move- .ment ofthe work andthe rotating head, .thecylindrical surface of theiworlf:v maybe smoothed and to a substantial degree trued from end to end.

Note that ythe segments IIlfand` their tsupporting shoes are connected by intermediate links `IiI tothe rings 5I andthe links 59 provideloose connectionswith the centers 62. Thus the subjection of the shoesand segments to centrifugal force, as a result oftherotation of the head A, causes a generally uniform thrust'of-all parts of the outer surface ofthe segments against the inner surface of the work.l I 3 e Y It Will be, understood,` of cours-e, that'thecouny to be planed or ground off. Experience indicates alsov that'the interior' ofthe Work isgground down to a close'approximation to a truly uniformdiameter. ,f y

It is even possibley to convert a :more or lesstaperedtube fromy a tube of uneven diameter by controlling thelength.ofthe'passes and giving .the tool aprogressively greater 4number of passes through t-he initially more restricted part of the tube.. Theinvention may thus .be employed to obtain the following effects 453m ,(a), The 4smooth finishing of the interior surface; f

- (b.) The elimination'of irregularities and sharp variations in radius of the inner surfaces (c) The general truing up of the inner surface Yto give it,l at anypoint, ari-approximation totruly circular cross section; and

L (d) `.l'tendering theinterior ofthe tubular element of substantially uniform. diameter from end .to end.

kes

rial. t5 j Itwiu be unrstoa that the cuenten/eighting of the shoe.i6,3 provides an automatic adjustment, since as the :grinding material Wears away, the heavy metal shoe advances further from the center ofrotation and thereby increases its centrifugal weight. Also thefcounterweight retracts ytoward-.the center 'of rotation and thereby'loses some. ofthe: centrifugal weight, thus compensating for loss .of actual weight of grinding mate- Iclaim:` 1. In a finishing device for nishing'an interior generally cylindrical. surface, a base, a 'work support movably mounted on said base, means for securingthe work in relation to the work support,

With-the axis of the interior aperture of the work parallel with the path of movement of the work support, a: rotary surface grinding element, and

, means' for rotating it about an axis parallel with and generally concentric with the axis'of the surifaceltolibe nished; a.l support for -the rotary elej 1112. Ina-nishing device for finishing trifu'gally movable work engaging' members, and

means fon adjusting the centrifugal outward 'thrustfof saidmembers. l Y

an interior 'gene'.rall'y cylindrical surface, a base, a tool sup- -p'ortextending from said base, said support including alateral extension of substantial length and of a diameter less than the interior diameter ofthe work, a hollow shaft rotatably mounted in Ysaid horizontal extension, a rotary finishing head mounted on said shaft, and means for delivering a cooling liquid adjacentvthe areaof engagement with-the work, including one ormore ducts in Icommunication with the interior of said `hollow `slhaft,and means for delivering the cooling liquid to the hollow shaft, and means for preventing ra- Vdial escape of the liquid lthrough the work, when the work` is apertured, including screening means removably surrounding the work and in alignment with the aperture or apertures thereof.

3. In a finishing device for finishing an interior vgenerally cylindrical surface, a base, a tool support extendingr from said base-a rotary finishing `nient extending generally along' the axis of the head mounted on-said toolsupport, said tool support `including 'an' extension of smaller diameter than the interior diameter of the'work, a movable carriage for the work, and means for guiding it along a path parallel with the axis of rotation of the'nishing head, means for moving said Y carriage along said path, including an elongated A rack secured to said carnage, a pinionopposed to `said rack and means for Yrotating it, and guiding and supporting means for the end of the rack beyond the pinion, Y

4. vIn a nishing device for finishing an interior generally cylindrical surface, a base, a tool support extending from said base,` a rotary nishing head mounted on said tool support, said tool supportincluding an extension ofsmaller 'diameter than the interior diametereof the work, a Inov-v able carriage for the work, and means for guiding it along a path parallel with the axis of rotation of the finishing head, meanswfor moving said carriage along said path, including-an' elongated'raek secured to said carriage, a pinion opposed to said rack and means for rotating it, and guiding and supporting means for the end of the 'rack .beyond thepinion, and means for preventing separation of rack and pinion.

5. In a finishing device for nishing aninterior generally cylindrical surface, a base, a .tool support extending from said base, a'rotary finishing head mounted on said tool support, said tool support including an extension ofsmaller diameter than the diameter of the work, a movable carriage for the work, and meansy for guiding it along a path parallel with the axis of rotation ofthenishing head, means for moving said carriage along said path, including an elongated rack 'secured to said carriage, a pinion opposed to said rack and means for rotating it, and guiding and supporting means for the end of the rackbeyondthe pinion,

and stop 4means on said;rack adapted to limit the length ofI excursion of the carriage.v l

6, In a nishingdevice foriiinishing an'interior A generally cylindrical surface, a Abase, aftool sup- ;,port extending from saidfbase, a rotary iinishing head mounted on said `tool support, said tool supn port including an extension ofsmaller `diameter than the interior diam-eterof the'work, a movable carriage `furthework,v and means for guiding it ralong a path parallel with the axis ofrotation of the nishing head, means for moving said carriagefalon'g said path, including an elongated rack secured 'to said carriage, a pinion opposed to said rack 'and means forrotating it, and guiding and supporting means for the end of the rack beyond the pinion,v 'and adjustable stop means on said rack adapted to limit the length of excursion of the carriage. f

7. In a device for finishing an interior generally cylindrical surface, a base, a generally horizontal support mounted vat one end on the base and havingits opposite end free, a vshaft-mounted in said support for.' rotation about a generally horizontal axis, and means for rotating it, a work- .'ing head on said shaft, beyond the free rend of lthe support, a plurality of' working elements mounted on said head for centrifugal outward movement, a carrier for the work to be treated, mounted Lon saidbase for movement along a path parallel with the axis of frotation of said shaft, means for :adjustably securingthe work on the carrier,` and for centering the axis -of the interior cylindrical surface of the work with the center of rotation of said shaft, and means for moving thecarrier, with the Work on it, along said support during rotation of said shaft, wherebyvthe interior of the Work is subjected to the centrifugal outward thrust of the Working elements on said head, and means for adjustably controlling the centrifugal outward thrust of each working element.

'8. 4In a device for finishing an interior generally ycylindrical surface, a base, a generally horizontal support mounted atone end on the base and having its'opposite end free, a shaft mounted in said support for rotation about a generally horizontal axis, and means for rotating it, a working head on said shaft, beyond the free end-'of vthe support, a plurality of working elements .mounted ony said head for centrifugal outward movement, a carrier for thework to be treatedjmountedon 'said Ybase formovement along a path'parall'el with the axis of rotation of said shaft, means for adjustably securing the work on the carrier, and for centering the axis ofthe in- ,teriorf cylindrical surface of the work with the center ofrotation of 'said shaft, and `means for moving.A the carrier, with thenwork on it, along said support duringrotation of said shaft, whereby the interior of "the work is subjected tothe centrifugal outward thrust of the working elements on said head, and means for adjustably i Vcontrolling Athe centrifugal outward ,thrust of each ytplurality of working elements mounted on said head for centrifugaloutward movement, a carrier for the work to be treated, vmounted on said base for movement along a path ,parallel with the aXis of rotation of "said shaft, means for adjustably s'ecuringthe work on the carrier, and for centeringith'e axis :of theinte'rior cylindrical surface of the work with the-center of rotation of said shaft, `and .means'for' moving the carrier, with the work 4on it, along said support during rotation ofsaid shaft; whereby the interior of the workis subjected to the centrifugal loutward thrust ofthe working elements on said head, and means .for adjustably. controllingV the centrifugal outward thrust of each working element, includingr a bell crank lever pivoted on the head, a, flexible connection between one arm of said lever and the working element, and a counterweight adjustable along the other arinof the lever,

10.' In a device for finishing an interior generally cylindrical surface, a base, a generally horizontal'support mounted at one end on the base and having its opposite end free, a shaft mounted in said support for rotation about a Vgenerally horizontal axis, and means for rotating it, a working head on said shaft, beyond the free end of the support, a plurality of working elements mountedon said head for centrifugal. -outward movement, a carrier for the workto be treated, mounted on said base for movement along a path parallel with the axis of rotation of said shaft, means for adjustably securing the work on the carrier, and for centering the axis of the interior cylindrical surface of the work with the center of rotation of said shaft, and means for moving the carrier, with the work on it, along said support during rotation of said shaft, whereby the interior of the work is subjected. to the centrifugal outward thrust of the working elements on said head, and means for adjustably controlling the centrifugal outward thrust of each working element, including a bell crank lever pivoted on the head, a flexible connection between one arm of said lever and the working element and a counterweight on the other arm of the lever, and yielding means tending normally to move each said working element toward inoperative position.

11. In a device for finishing an interior generally cylindrical surface, a base, a generally horizontally extending tool support mounted at one end only on said base, and including an extension, generally parallel with said base, of substantial length and of a diameter less than the interior diameter of the work, a working head rotatably mounted at the end of the support, means for rotating it, la work carriage mounted on said base for movement in parallelism with the axis of said head, and means for adjustably supporting the work on said carriage with the axis of the interior aperture of the work generally concentric with the axis of rotation of the head, including a plurality of work supports longitudinally spaced along said carriage, and work engaging members adjustably mounted on said work supports, for movement toward and away from the axis of said head, said work supports having each a work receiving depression which is upwardly open and adapted partly to surround the work.

12. In a device for finishing an interior generally cylindrical surface, a base, a generally horizontally extending tool support mounted at one end only on said base, and including an extension, generally parallel with said base, of substantial length and of a diameter less than the interior diameter of the work, a working head rotatably mounted at the end of the support, means for rotating it, a work carriage mounted on said base for movement in parallelism with the axis of said head, and means for adjustably supporting the work on said carriage with the axis of the interior aperture of the work generally concentric with the axis of rotation of the head, including a plurality of work supports longitudinally spaced along said carriage, and work en- Ygagging. members adjustably mounted on said work 'supportsfor movement toward and away from vthe axis ofY said head, said work supports each -havinga work receiving depression which is up.- war'dly open and adapted partly to surround the work, saidwork engaging members. being spaced aboutsaid depressions and being located at various levels'inrelation to the work.

13. In a device for `finishing an interior generallycylindrical surface, a base, a generally horizontally extending tool support mounted at one end only on said basa-and including an extension, generally parallel with said base, of substantial length and of a diameter less than the interior diameter of the work, a working head rotatably mounted at the yend of thev support, means for rotating it, a work carriage Vmounted on said base for movement in parallelism with the axis of said head, and means for adjustably supporting the work on saidcarriage with the' axis ofithe interior raperture of the workgenerally concentric with the axis of rotation of the head, including a plurality of work supports longitudinally spaced along said carriage, and work engaging members adjustably mounted on said work supports, for movement toward and away from the axis of said head, said work supports each having a work receiving depression which is upwardly open and adapted partly to surround the work, said work engaging members being spaced about said depressions and being located at various levels in relation to the work, the lowest of said work engaging members being positioned and adapted to underlie and support the downward gravital thrust of the work, the highest of said work engaging members being positioned to prevent unintended lateral movement of the work.

14. In a work support for members having a cylindrical inner surface, adapted for use with a tool for finishing such surface, a carriage, a track for said carriage, and means for conveying said carriage therealong, a plurality of work supports longitudinally spaced along said carriage, and a plurality of work engaging members mounted for independent adjustment on each said work support, and means for adjusting them toward and away from the axis of said cylindrical surface, said work supports having upper edges provided with upwardly open portions conforming roughly to the form of the work.

15. In a work support for members having a cylindrical inner surface, adapted for use with a tool for finishing such surface, a carriage, a track for said carriage, and means for conveying said carriage therealong, a plurality of work supports longitudinally spaced along said carriage. and a plurality of work engaging members mounted'for independent adjustment on said work support, and means for adjusting them toward and away from the axis of said cylindrical surface, said work supports having upper edges provided with upwardly open portions conforming roughly to the form of the work, and dening generally arcuate recesses extending about substantially one hundred eighty degrees of arc.

16. In a device for finishing an interior generally cylindrical surface, a base, a tool support, mounted at one end only on said base, and including a generally horizontal extension of substantial length and of a diameter less than the interior diameter of the work, a working head rotatably mounted at the end of the support and means for rotating it, a work carriage mounted on; said' base for; movement: ini parallelism with the; axis' of the head', and' means-"for adjustably supportingY the. work on; said carriage,- with .the axis ofthe interior apparatus of the. workflgen.- eralyconcentric'wth the axis of; rotation ofthe head, nmu'dng,` a. plurality :of longitudinally spaced` Work supports, earch; said work' support having an upwardly open recess partly surrounding the. Work, 81ndv a 'plurality of Work: engaging members spaced crcumferentially aboutthe recess and: indepementlyI adjustable` towardy and away` from the` axis' of said cylindrical surface;

' HENRY TALBOYS.

REFERENCES CITED kName Date Whitin oct. 19', 1915 Number Number Name Date Crandall May 2, 1916 Hellyar Dec. 22, 1936 Winland May 19,V 1942 Rioux Sept. 23, 1941 Webber Dec. 29, 1925 York et al. Apr. 7,1931 Roth Aug. 2,8, 1900 Forsyth Dec.. 7, 1897 Heon Aug. 25,1925 Gettig, et;L a1 June 19, 1934 Hyde et al. Jan. 3, 1888 Joseph Nov. 8, 1921 Baumberger Mar. 6, 1928 Mundt etal Oct. 3, 1939 Musheno May 16, 193.3 Norton- May- 12, 1914 Bavard, Aug. 24, 1943 Yerk et a1. Aug1 28, 1928 Baumberger et al. Aug. 28, 1928 

